WO2009158557A2 - Embout de mesure acoustique - Google Patents

Embout de mesure acoustique Download PDF

Info

Publication number
WO2009158557A2
WO2009158557A2 PCT/US2009/048749 US2009048749W WO2009158557A2 WO 2009158557 A2 WO2009158557 A2 WO 2009158557A2 US 2009048749 W US2009048749 W US 2009048749W WO 2009158557 A2 WO2009158557 A2 WO 2009158557A2
Authority
WO
WIPO (PCT)
Prior art keywords
tip
acoustic
path
acoustic path
tube
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2009/048749
Other languages
English (en)
Other versions
WO2009158557A3 (fr
Inventor
Michael T. Mcmahon
Steven R. Slawson
David C. Woods
Andrew J. Kugler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Welch Allyn Inc
Original Assignee
Welch Allyn Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Welch Allyn Inc filed Critical Welch Allyn Inc
Publication of WO2009158557A2 publication Critical patent/WO2009158557A2/fr
Publication of WO2009158557A3 publication Critical patent/WO2009158557A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/12—Audiometering
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/18—Methods or devices for transmitting, conducting or directing sound
    • G10K11/22—Methods or devices for transmitting, conducting or directing sound for conducting sound through hollow pipes, e.g. speaking tubes

Definitions

  • This invention relates generally to an acoustic tip and more particularly to an acoustic tip for an audiological medical instrument.
  • a "tip" of the prior art includes components used to make an acoustic-mechanical connection with the ear of a patient for medical instruments that can sense and measure physiological parameters of the human ear.
  • a pliable silicone or plastic tip having a flexible surface, such as a flexible seal can be seated against the outer surface of the auditory canal for acoustic measurements.
  • the tip can provide both an acoustic interface to the auditory canal as well as a pneumatic pressure seal.
  • the properties of the acoustic interface should be compatible with the frequency or tone of test signals being used.
  • a medical instrument In the field of tympanometry, an example of a field that relates to acoustic measurements of the ear, a medical instrument typically measures the impedance or admittance of the ear canal/tympanic membrane/middle ear system.
  • an audio signal is first transmitted into the auditory canal, generally by an acoustic transmitter, such as a small speaker in the tympanometric instrument while a small microphone in the instrument simultaneously monitors sound in the auditory canal. This process is continued while varying the static pressure inside the ear canal, typically using a pump or similar means.
  • the instrument can thus measure the changing impedance or admittance of the ear system as a function of pressure. The results of such measurements, indicating mobility of the tympanic membrane and ossicular chain, can be helpful to clinicians in assessing and diagnosing various conditions and pathologies of the ear.
  • a tip for coupling sound between a medical instrument and an ear which includes a sealing surface configured to substantially conform the tip to an auditory canal of the ear.
  • the sealing surface includes a plurality of openings.
  • the tip also includes a first acoustic path having an acoustic tube acoustically coupled to at least one of the plurality of openings, the acoustic tube being disposed within the tip.
  • the tip also includes a second acoustic path acoustically coupled to at least another one of the plurality of openings in the sealing surface, wherein a selected one of the first acoustic path and the second acoustic path is configured for acoustic transmission, and another one of the first acoustic path.
  • the second acoustic path is further configured for acoustic detection, the acoustic tube of the first acoustic path being configured to substantially acoustically isolate the first acoustic path from the second acoustic path.
  • the tip includes one or more mechanical attachment members configured to mechanically suspend the acoustic tube within the tip.
  • the acoustic tube and the one or more mechanical attachment members include substantially the same material.
  • the material includes a pliable material.
  • the pliable material includes a silicone.
  • the acoustic tube is mechanically suspended substantially on a longitudinal axis of the tip.
  • the sealing surface includes a diameter larger than an opening to the auditory canal.
  • the configuration to substantially acoustically isolate the first acoustic path from the second acoustic path substantially suppresses Helmholtz resonance effects at the tip.
  • the configuration to substantially acoustically isolate the first acoustic path from the second acoustic path reduces noise.
  • the configuration to substantially acoustically isolate the first acoustic path from the second acoustic path provides artifact rejection.
  • the at least a selected one of the first acoustic path and the second acoustic path is acoustically coupled to an acoustic detector configured for the acoustic detection.
  • the acoustic detector includes a microphone.
  • the acoustic path is configured for acoustic transmission includes at least one speaker.
  • the tip further includes a plurality of acoustic paths, at least a selected one of the plurality of acoustic paths acoustically coupled to more than one of the plurality of openings.
  • the acoustic path configured for acoustic transmission operates at one or more selected frequencies over a range of frequency of about 200 Hz to 20 kHz.
  • the acoustic transmitter operates at about
  • the tip is a disposable tip.
  • the tip is configured for single use and wherein at least the sealing surface includes a material designed to deteriorate to discourage reuse.
  • the tip is configured to deteriorate on exposure to a cleaning chemical.
  • the medical instrument is a tympanometric instrument.
  • the tympanometric instrument further includes at least one pump configured to apply a pressure in the auditory canal via the at least one at least one of the plurality of openings in the sealing surface.
  • the acoustic tube is configured to slidably engage an extension tube disposed within a front end of the medical instrument.
  • the tip remains substantially free of
  • an acoustic measurement apparatus includes a tip having a sealing surface configured to substantially conform the tip to an auditory canal of the ear.
  • the sealing surface includes a plurality of openings.
  • the tip further includes an acoustic tube acoustically coupled to at least one of the plurality of openings defining a first acoustic path, the acoustic tube being disposed within the tip, the tip also includes a second acoustic path acoustically coupled to at least another one of the plurality of openings in the sealing surface.
  • a selected one of the first acoustic path and the second acoustic path is configured as a path for acoustic transmission, and another one of the first acoustic path.
  • the second acoustic path is further configured as a path for acoustic detection, and the acoustic tube of the first acoustic path is configured to substantially acoustically isolate the first acoustic path from the second acoustic path.
  • the acoustic measurement apparatus includes an acoustic measuring device.
  • the acoustic measuring device includes a front end which receives the tip, the front end includes at least two acoustic paths configured to acoustically couple to the first acoustic path and the second acoustic path of the tip.
  • the acoustic measuring device also includes an
  • the acoustic measuring device also includes an acoustic detector coupled via the path for acoustic detection.
  • the acoustic measuring device also includes an electronics package electrically coupled to the acoustic transmitter, the electronics package also being electrically coupled to the acoustic detector.
  • the electronics package includes at least one microcomputer. The at least one microcomputer is configured to run an algorithm for performing an acoustic measurement.
  • the tip includes one or more mechanical attachment members configured to mechanically suspend the acoustic tube within the tip.
  • the tip including the acoustic tube and the one or more mechanical attachment members, includes substantially the same material.
  • the material includes a pliable material.
  • the pliable material includes a silicone.
  • the acoustic tube is mechanically suspended substantially on a longitudinal axis of the tip.
  • the sealing surface includes a diameter larger than an opening to the auditory canal.
  • the configuration to substantially acoustically isolate the first acoustic path from the second acoustic path substantially suppresses Helmholtz resonance effects at the tip.
  • the configuration to substantially acoustically isolate the first acoustic path from the second acoustic path reduces noise.
  • the configuration to substantially acoustically isolate the first acoustic path from the second acoustic path provides artifact rejection.
  • the acoustic detector includes a microphone.
  • the acoustic path is configured for acoustic transmission includes at least one speaker.
  • the tip further includes a plurality of acoustic paths, at least a selected one of the plurality of acoustic paths acoustically coupled to more than one of the plurality of openings.
  • the acoustic path configured for acoustic transmission operates at one or more selected frequencies over a range of frequency of about 200 Hz to 20 kHz.
  • the acoustic transmitter operates at about
  • the tip is a disposable tip.
  • the tip is configured for single use and wherein at least the sealing surface includes a material designed to deteriorate to discourage reuse.
  • At least a portion of the tip is configured to deteriorate on exposure to a cleaning chemical.
  • the medical instrument includes a tympanometric instrument.
  • the tympanometric instrument further includes at least one pump configured to apply a pressure in the auditory canal via the at least one at least one of the plurality of openings in the sealing surface.
  • the acoustic tube is configured to slidably engage an extension tube disposed within a front end of the medical instrument.
  • the front end is configured to mechanically couple with the acoustic tube with a range overlap, wherein once mechanical engagement of the tip creates a substantially air tight seal between the first acoustic path and the second acoustic path of the tip and the front end, the tip remains substantially free of Helmholtz resonance over a range of depths of the overlap.
  • the front end is configured to mechanically couple to the acoustic tube with a range overlap, wherein once mechanical engagement of the tip creates a substantially air tight seal between the first acoustic path and the second acoustic path of the tip and the front end, the tip remains substantially free of a Helmholtz resonance over a range of depths of the overlap.
  • the apparatus is a portable instrument that further includes a display communicatively coupled to the microcomputer and configured to display a result of a tympanometric measurement.
  • the front end further includes a central core having a central core stem section, wherein the central core stem section is configured to slidably engage the acoustic tube in order to complete the first acoustic path.
  • the central core further includes at least one acoustic channel which is acoustically coupled to the second acoustic path of the tip.
  • the front end further includes a reinforcing sleeve disposed coaxially over the central core and the reinforcing sleeve is configured to mechanically engage the tip to mechanically mount the tip onto the front end.
  • a method of affixing a tip for the acoustic measurement of an ear to a front end of an acoustic measurement instrument includes the steps of: (a) providing an acoustic tip configured to make a seal with an auditory canal of the ear, the sealing surface includes a plurality of openings, and defining at least a first and a second acoustic path, the first acoustic path of the tip includes an acoustic tube substantially extending substantially to the sealing surface;
  • the method further includes the step (d) sliding the tip off of the front end to sealingly dis-engage both the acoustic tube of the at least a first acoustic path and the second acoustic path of the tip using an ejector device.
  • FIG. 1 shows a cutaway side view of a traditional 226 Hz tympanometric instrument in accordance with the prior art
  • FIG. 2 A shows a cutaway side view of one exemplary embodiment of the inventive tip
  • FIG. 2B shows an end view of the tip of FIG. IA
  • FIG. 3 illustrates the tip seal of FIG. 2A and FIG. 2B as seated and sealed against the outer surface of an auditory canal;
  • FIG. 4A shows a perspective distal view of an exemplary inventive tip
  • FIG. 4B shows a perspective proximal view of an exemplary inventive tip
  • FIG. 5 A shows an illustration of the tip of FIG. 4A and FIG. 4B inserted onto the front end of a medical instrument
  • FIG. 5B shows a slightly more detailed cutaway side view of one exemplary front end and tip of FIG. 5 A;
  • FIG. 6A shows a perspective view of an exemplary central core of a tip including a stem section
  • FIG. 6B shows a side view of the exemplary central core of FIG. 6A
  • FIG. 6C shows another perspective view of an exemplary central core highlighting the lower section
  • FIG. 7 A shows an exemplary (neo-natal) sized tip according to the invention
  • FIG. 7B shows an exemplary small sized tip according to the invention
  • FIG. 7C shows an exemplary medium sized tip according to the invention
  • FIG. 7D shows an exemplary large sized tip according to the invention
  • FIG. 7E shows an exemplary extra large sized tip according to the invention
  • FIG. 8A shows a side view of a prior art probe using a single bore tip
  • FIG. 8B shows a side view of the probe of FIG. 8A with the single bore tip removed
  • FIG. 8C shows an end view of the acoustic channels of the probe front end
  • FIG. 8D illustrates how a slightly misplacement of the prior art tip of
  • FIG. 8B can create a volume that causes undesired Helmholtz resonation
  • FIG. 8E illustrates how a slightly different misplacement of the prior art tip as shown in FIG. 8D can also create a volume that causes undesired Helmholtz resonation
  • FIG. 9A shows a graph of sound amplitude at a microphone recorded as a microphone voltage output in millivolts (peak to peak (mV p-p) plotted against frequency for a prior art, traditional 226 Hz device tip;
  • FIG. 9B shows a graph of the results of the same laboratory test performed in FIG. 9A using an exemplary tip according the invention;
  • FIG. 1OA shows a block diagram of an exemplary tympanometric instrument suitable for use with the inventive tip;
  • FIG. 1 OB illustrates the tympanometric instrument of FIG. 1 OA as positioned on a patient's ear.
  • Tympanometry has traditionally been performed at an audio frequency of 226 Hz. As previously noted, it is now believed that more accurate results can be achieved using a higher frequency.
  • the task force in newborn screening (JCIH), for example, has recommended that 1,000 Hz become the new standard frequency for tympanometry.
  • JCIH newborn screening
  • FIG. 1 shows one exemplary tip of the prior art.
  • prior art tips 300 give erroneous results can be attributed to the 'Helmholtz Resonator' acoustic phenomenon, which begins to take place at the higher frequency. This effect, in which the slug of air residing in the tip's distal bore begins to resonate, reduces the sound pressure immediately in front of the microphone.
  • the microphone thus reports a lower sound level than actually exists in the ear canal and the corresponding measurement, such as an admittance level, is reported in error by the instrument.
  • the Helmholtz acoustic phenomenon is described in more detail in Appendix I. It has subsequently been realized that the tip and mating front end designs can be suitably modified such that the tip itself becomes a functioning part of the acoustical system.
  • tip is defined as a component that can matingly engage the "front end" of an acoustic instrument and to provide a substantially sealed mating interface to a physiological structure, such as the
  • a tip is a removable element generally made from one or more pliable materials.
  • a tip as construed herein is typically manufactured and made available in a number of various sizes. The purpose of providing a range of seal sizes is to provide a substantially optimal seal with an animal or human physiological feature of varying sizes, most commonly the opening to an auditory canal of the human ear. Suitable tip sizes can vary from human to human or from animal to animal, such as by age (e.g. a baby's ear and an adult's ear). Generally what distinguishes the various tip sizes is the size of the sealing surface.
  • a tip as herein described that provides a mechanical acoustic interface between a medical instrument, such as a tympanometric instrument, and the human ear.
  • the tip is typically associated with and attached to the medical instrument via a medical instrument "front end".
  • the word "tip” does not include the front end or elements of an acoustic instrument or device front end.
  • An instrument or device front end generally includes an assembly of parts, typically including one or more acoustic channels.
  • a user can matingly affix a tip to a front end which conducts acoustic energy to and from the rest of the device such as via discrete metal tubes or other surgical tubes that typically extend to, or into a tip.
  • acoustic tube as used herein is defined as an integral part of the tip.
  • a tip can typically be molded in one piece from a pliable material such as silicone, a tip made from more than one material, such as, for example, including a pliable seal and a less pliable acoustic tube does still fall within the meaning of the term tip as contemplated herein.
  • a removable tip is always a one piece component once manufactured, the tip can be manufactured from more than one discrete part and more than one type of material.
  • FIG. 2A shows a cutaway view of one exemplary embodiment of the inventive tip herein referenced as 100.
  • FIG. 3 illustrates how a sealing surface 103 (typically a curved surface) can provide, for example, a substantially air-tight acoustic seal with the exposed outer surface of the auditory canal of the ear.
  • a sealing surface 103 typically a curved surface
  • an especially pliable material can be substantially flat until pressed and conformed to the surface to which the tip is to seal against.
  • a tip 100 can also seal against the inner surfaces of the auditory canal (not shown in FIG. 3).
  • a plurality of openings 106 FIG. 2A, FIG.
  • tip 100 extending into the distal end of the tip can provide both an acoustic and a pneumatic air pathway for sound generated by a medical instrument, such as a tympanometric instrument, to enter the auditory canal of an ear being tested.
  • a medical instrument such as a tympanometric instrument
  • Air flow for vacuum or pressurization of the ear canal can typically be accomplished, such as with a pump, through openings 106 and air channels 110.
  • a pump can be configured to apply a pressure different from ambient atmospheric pressure in the auditory canal (not shown) via openings 106.
  • Opening 105 shown substantially in the center of the tip 100 and air channel 111 provides an acoustic air pathway for sound to return to a microphone, or equivalent sound energy measurement transducer or acoustic detector, disposed within an attached medical
  • Acoustic tube 101 which is mechanically coupled to a sound transducer, such as a microphone, or a microphone tube that can couple to a microphone, represents an advance over the prior art.
  • Section 107 provides a first roughly cylindrical shaped opening 108.
  • Lower microphone tube section 104 also provides a second roughly cylindrical shaped opening 109.
  • Sections 104 and 107 can act as connector receptacles for mechanical attachment to the "front end" of the medical instrument as described further below.
  • tip 100 includes an acoustic tube
  • Acoustic tube 101 which can continue as a separate tube extending substantially out to the distal end of tip 100.
  • Acoustic tube 101 can generally be affixed substantially coaxially within a tip 100 by connecting members 112.
  • connecting members 112 See also FIG. 4B
  • acoustic tube 101 can be mounted within tip 100 at other than the longitudinal axial center of tip 100.
  • an acoustic tube 101 can be present as defined, and largely surrounded by air, except mounted off-center within tip 100 and/or acoustically coupled to an off-center opening 105.
  • Acoustic tube 101 keeps the microphone channel 109 substantially isolated from any Helmholtz effects that can occur further back in the tip. By adding acoustic tube 101 to the inventive tip, measurement accuracy was restored. Therefore, acoustic tube 101 solves the problem of Helmholtz resonation of a volume of air between a sound sensor disposed in the medical instrument and the interface between the tip and the auditory canal.
  • acoustic tube 101 can also help to minimize undesirable noise interference and provide artifact rejection.
  • separation of the acoustic paths can reduce the amount of noise that interferes with the returning signal.
  • any generated noise first fills the volumes in both the front end and the tip before entering the detection channel and the noise fills the volume under test at the same time as it travels back to the detection device. Filling these volumes while maintaining separation reduces the intensity of the noise and provides some filtering.
  • a tip having substantially the structure shown in FIG. 2A and 2B can be used for acoustic measurements from about 200 Hz to 8 kHz. It is contemplated that such a tip can be used to perform substantially accurate audio measurements all of the way to the end of the audible range of the audio spectrum in the vicinity of 20 kHz.
  • tips 100 as contemplated herein can be removable, some can be simply replaceable, such as to remove for cleaning or to change tip sizes.
  • tips 100 can be manufactured from more economical materials, such as for example PVC plastics, can be considered disposable.
  • PVC plastics can be considered disposable.
  • One of the advantages of disposable tips is the far reduced risk of cross contamination from patient to patient.
  • a relatively fast degrading or deteriorating plastic such as a fast degrading PVC can be used.
  • a cleaning chemical such as a disinfecting agent
  • At least some portion of a so designed tip would begin to deteriorate, especially in the thinner seal area after exposure to cleaning chemicals, rendering it useless and thus intentionally and by design discouraging reuse.
  • FIG. 4A and FIG. 4B show respectively a front and rear perspective view of tip 100.
  • Tip 100 can generally be manufactured from a pliable material, such as silicone, so that the sealing surface 103 can more easily conform, for example, to the surface of an individual's ear.
  • Tip 100 can be made by any suitable manufacturing process such as, for example, by injection molding.
  • FIG. 5A shows a simplified cutaway side view of the instrument front end 500 and tip 100.
  • Exemplary medical instrument front end 500 includes a reinforcing sleeve 502 and a central core 503.
  • a tip ejector 507 can be provided, this component being configured to slide axially to eject tip 100, such as after use or for changing to another sized tip.
  • tip ejector 507 can be manually operated by pushing tip ejector 507 laterally towards tip 100, thus sliding tip 100 off of both reinforcing sleeve 502 and central core 503.
  • Reinforcing sleeve 502 can be disposed on housing 501 to provide a stiffer or more resilient material in order to reduce wear caused by sliding tips 100 on and off of the front end 500 and/or to provide a better pneumatic seal with a tip 100.
  • Reinforcing sleeve 502 and a portion of body 501 under reinforcing sleeve 502 can substantially fill the cylindrical volume between an inner surface of tip section 107 and an outer surface of tip section 104.
  • Reinforcing sleeve 502 also can provide protection for central core 503 disposed within a medical instrument housing 501, particularly for the stem section 506 of central core 503 (FIG.
  • FIG. 5B shows that the stem section 506 of central core 503, a continuation of the microphone tube (a microphone extension tube), extends into section 104 of tip 100 by slidable engagement, and thus substantially isolates the microphone channel from the speaker and pressure channels 110 until opening 105.
  • the overlapping nature the engagement between section 104 of tip 100 and the stem section 506 of central core 503 is configured such that a user does not have to place the tip onto the front end with precision. Once a small amount of engagement has occurred, the central channel stays isolated from the other components, and the threat of Helmholtz resonating is eliminated.
  • a tip 100 already has more than sufficient overlap, even if not slid all of the way onto reinforcing sleeve 502. Thus a user not
  • the housing 501 can typically be manufactured from a plastic-type material that can be formed, such as for example, by injection molding, or other similar process.
  • Reinforcing sleeve 502 can be manufactured from any substantially rigid material, such as plastic or metal, including brass, stainless steel, or aluminum.
  • Central core 503 can be cast or otherwise manufactured from any substantially suitable rigid materials, such as plastics or metals including brass, stainless steel, or aluminum. The specific types of materials used to manufacture housing 501, reinforcing sleeve 502, and central core 503 are not essential to the workings of these components and are intended to be exemplary for the sake of completeness.
  • FIG. 6 A shows a perspective view of an exemplary central core 503, including a stem section 506.
  • a lower section 602 of central core 503 includes a set of channels 504 which extend the speaker and pressure channels 110 from tip 100 openings 106 as well as extending the microphone channel 505 from microphone channel 111 within tube 110 of tip 100 to tip 100 opening 105.
  • Lower section 602 of central core 503 also supports stem section 506. Note that section 104 of tip 100 indexes onto stem section 506 when a removable tip 100 is affixed to the medical instrument front end section 500 (See also FIG. 5A).
  • FIG. 6B shows a side view of an exemplary central core 503.
  • FIG. 6C shows a perspective view of an exemplary central core 503 highlighting lower section 602.
  • tips and associated mating components used on traditional 226 Hz tympanometric devices typically have acoustic characteristics that can reduce the accuracy of measurements made at 1,000 Hz or higher frequencies.
  • prior art devices generally use tips that require accurate physical placement to maintain measurement accuracy as well as using front end construction that contains fragile components.
  • a plurality of various sized tips 100 can be made available in order to fit most typical human ear shapes and sizes.
  • Typical sizes include neo (neo-natal) (FIG. 7A), small (FIG. 7B), medium (FIG. 7C), adult large (FIG. 7D), and adult extra large tips (FIG. 7E).
  • neo neo-natal
  • FIG. 7B small
  • FIG. 7C medium
  • FIG. 7D adult large
  • FES 7E adult extra large tips
  • the size and/or shape of the distal sealing surface 103 changes while tip sections 104 and 107 remain substantially constant so as to provide a standard connection to the front end of a medical instrument.
  • the central pathway including stem 506 and channel 505 generally connects with the microphone.
  • the microphone and speaker can be switched since isolation between the two pathways is maintained as long as at least one channel ends substantially at the distal end of the tip.
  • a microphone acoustic path and speaker acoustic path have been designated according to the exemplary embodiments, the specific path or paths used for the microphone and the speaker are not essential and as noted above, and can be switched.
  • the isolated acoustic paths e.g. opening 105, shown substantially in the center of the distal sealing surface 103 and air channel 111, and the openings 106 and air channels 110 of FIG, IA and FIG.
  • a first acoustic path includes an acoustic tube acoustically coupled to at least one of a plurality of openings in the tip seal,
  • a second acoustic path can be acoustically coupled to at least another one of the plurality of openings in the seal. At least one of the first acoustic path and the second acoustic path can be configured for acoustic transmission. Another path, (first acoustic path or second acoustic path) can be configured for acoustic detection.
  • the acoustic tube of the first acoustic path can be configured to substantially acoustically isolate the first acoustic path from the second acoustic path and thereby substantially suppresses Helmholtz resonance effects at the tip.
  • FIG. 8A shows a side view of a prior art probe 800 for use at 1,000 Hz.
  • FIG. 8B shows a side view of the probe front end 802 of FIG. 8A with the single bore prior tip 801 removed.
  • FIG. 8C shows an end view of the acoustic channels of the probe front end 802.
  • FIG. 8D and FIG. 8E the slightest improper placement of a tip 801 causes the formation of an unintended volume or cavity 803.
  • SYLIB01 ⁇ 703 2 54 ⁇ l - 18 - such as in typical hospital ER settings where clinicians have little time to make diagnostic measurements.
  • a tip 100 according to the invention when used with an exemplary front end 500, need only make a substantially air tight connection at reinforcing sleeve 502 and where tip 100 indexes onto a stem section 506. Even with a relatively poor placement (poor, but still sufficient mechanical overlap) of tip 100, Helmholtz resonation does not occur because acoustic tube 101 continues as a separate tube substantially out to the distal end of tip 100. Also note that acoustic tube 101 can be typically provided coaxially substantially on a longitudinal axis of tip 100.
  • a tip 100 having a substantially centered acoustic tube 100 can also be rotated about the longitudinal axis without causing measurement error. Also, because of the flexibility of rotation and range of slidable mechanical engagement, there is no need for orienting features, such as for example, but not limited to, mechanical detents, rims, angled rims, or slots.
  • FIG. 9A shows a graph of sound amplitude at a microphone recorded as microphone voltage output in millivolts (peak to peak (mV p-p) plotted against frequency for a prior art tip.
  • the triangular shaped points were recorded for a simulated Ice volume and the circular data points taken for a simulated 2cc volume.
  • the graph of FIG. 9A was generated using a tympanometric instrument attached to a B&K type 4946 2cc microphone coupler.
  • a volume reducing sleeve was affixed into the B&K coupler to simulate the smaller Ice volume.
  • a calibrated B&K 1/2" type 4192 microphone was attached to the other side of the coupler.
  • FIG. 9B shows a graph of the results of the same laboratory test performed using a tip having a microphone tube, such as the exemplary acoustic tube 101 of FIG. 2A.
  • FIG. 9B shows a substantially consistent response more consistent across the Ice and 2cc test volumes.
  • a tympanometric instrument a medical instrument that can measure various acoustic-physiological parameters of the human ear.
  • Acoustic admittance a parameter measured by a tympanometric instrument, is the ease with which acoustic energy is transferred from one system to another. If the air in the ear canal is easily set into vibration, the admittance is high. If the air is difficult to set into vibration, the admittance of the system is low. The ease or difficulty of setting the air in the ear canal into vibration is determined by the volume of air and the admittance of the middle ear.
  • Tympanometry provides a method of evaluating the physical characteristics of the ear canal/middle ear system by measuring the admittance of the air trapped in the ear canal.
  • Tympanometry includes the measurement of acoustic admittance as a function of ear canal air pressure. The resulting graph is a tympanogram. Because ear canal air pressure changes the admittance of the tympanic membrane and middle ear, the admittance reported by the tympanometric instrument changes when the ear is pressurized. Positive or negative pressure, introduced into the sealed ear canal, decreases the admittance of the air in the ear canal by stiffening the eardrum.
  • FIG. 1OA A block diagram of one exemplary tympanometric instrument is illustrated in FIG. 1OA.
  • a tone can be introduced into the sealed ear canal by a miniature loudspeaker.
  • Prior art instruments and tips operate at 226 Hz by medical convention.
  • a miniature microphone records and monitors the sound pressure produced in the ear canal. The sound level is typically maintained at
  • a microcomputer computes acoustic admittance and plots admittance as a function of pressure on the liquid crystal display.
  • a tip according to the prior art can give satisfactory results for traditional tympanometric instrument operation at 226 Hz.
  • a tympanometric instrument operating at higher frequencies, such as 1,000 Hz can however, yield substantially accurate results using a tip according to the present invention.
  • the inventive tip is suitable for operation at traditional frequencies from 200 Hz (including 226 Hz) as well as at 300 Hz and above, including the newly proposed standard frequency of 1,000 Hz.
  • the acoustic tube has been shown in an exemplary embodiment as coupled to a single opening substantially in the center of the seal, an acoustic tube can alternatively be coupled to one or more opening not at the center of seal.
  • the operation of the devices described and claimed herein does not depend upon the accuracy or validity of the theoretical description. That is, later theoretical developments that may explain the observed results on a basis different from the theory presented herein will not detract from the inventions described herein.
  • the present invention has been particularly shown and described with reference to the preferred mode as illustrated in the drawing, it will be
  • FIG. 11 shows a conceptual diagram of a tip 300 according to the prior art sealed against a test cavity volume.
  • the test cavity volume 1105 represents an ear canal.
  • acoustic tube 1102 is used to generate a test sound pressure at a tone of frequency/ such as by use of a speaker driving acoustic tube 1102(not shown in FIG. 11).
  • Acoustic tube 1103 is used for detection with an acoustic detector (not shown in FIG. 11), such as a microphone.
  • a region of air resides between the acoustic tubes 1102 and 1103 and the larger test cavity volume 115.
  • the sound that issues from acoustic tube 1102 can cause a slug of air 1101 to begin to move as a unit into the larger volume 1105, which in turn acts a spring element and bounces slug of air 1101 back.
  • the slug 1101 can oscillate between two positions at some resonant frequency, much as a classic mass and spring system does.
  • the sound detection tube here, acoustic tube 1103 senses a pressure level smaller in magnitude than the actual sound pressure level in the larger volume.

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Surgery (AREA)
  • Pathology (AREA)
  • Biomedical Technology (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Biophysics (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Measuring And Recording Apparatus For Diagnosis (AREA)
  • Headphones And Earphones (AREA)

Abstract

La présente invention concerne un embout destiné à coupler un son entre un instrument médical et une oreille et comprenant une surface d’étanchéité configurée de manière à adapter sensiblement la forme de l’embout à un canal auditif de l’oreille. L’embout comprend un tube acoustique couplé de manière acoustique à au moins une ouverture choisie parmi une pluralité d’ouvertures et définissant un premier chemin acoustique. L’embout comprend également un second chemin acoustique couplé de manière acoustique à au moins une autre ouverture choisie parmi la pluralité d’ouvertures dans la surface d’étanchéité. Le tube acoustique du premier chemin acoustique est configuré pour isoler acoustiquement de manière considérable le premier chemin acoustique du second chemin acoustique. Un instrument de tympanométrie est conçu pour utiliser l’embout et pour fournir une mesure acoustique de l’oreille d’un patient.
PCT/US2009/048749 2008-06-26 2009-06-26 Embout de mesure acoustique Ceased WO2009158557A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US12/146,674 US7882928B2 (en) 2008-06-26 2008-06-26 Acoustic measurement tip
US12/146,674 2008-06-26

Publications (2)

Publication Number Publication Date
WO2009158557A2 true WO2009158557A2 (fr) 2009-12-30
WO2009158557A3 WO2009158557A3 (fr) 2010-04-01

Family

ID=41445323

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2009/048749 Ceased WO2009158557A2 (fr) 2008-06-26 2009-06-26 Embout de mesure acoustique

Country Status (2)

Country Link
US (1) US7882928B2 (fr)
WO (1) WO2009158557A2 (fr)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010114981A2 (fr) * 2009-04-01 2010-10-07 Knowles Electronics, Llc Ensembles de récepteur
US8419655B2 (en) * 2009-09-23 2013-04-16 JD Birck, LLC Method and apparatus for aural acoustic immittance measurement
US8550206B2 (en) * 2011-05-31 2013-10-08 Virginia Tech Intellectual Properties, Inc. Method and structure for achieving spectrum-tunable and uniform attenuation
US9155494B2 (en) 2011-01-24 2015-10-13 Etymotic Research, Inc. Hearing testing probe apparatus with digital interface
US8567555B2 (en) * 2011-12-09 2013-10-29 Jerry Harvey Dual bore canalphone system
US20120097475A1 (en) * 2011-12-29 2012-04-26 Schumaier Daniel R Hearing aid tip having multiple sound ports
US9333116B2 (en) 2013-03-15 2016-05-10 Natan Bauman Variable sound attenuator
US9521480B2 (en) 2013-07-31 2016-12-13 Natan Bauman Variable noise attenuator with adjustable attenuation
US10045133B2 (en) 2013-03-15 2018-08-07 Natan Bauman Variable sound attenuator with hearing aid
DK201470163A1 (en) * 2014-02-04 2015-08-17 Gn Otometrics As Hearing test probe
US9468400B2 (en) 2014-05-28 2016-10-18 Gn Otometrics A/S Audiologic test apparatus with dual probe system
EP2949271B1 (fr) * 2014-05-28 2021-08-25 Natus Medical Incorporated Appareil de test audiologique à double système de sonde
US9295585B1 (en) 2014-09-11 2016-03-29 Syracuse University Ear muffler
US9629575B2 (en) * 2014-12-30 2017-04-25 Natus Medical Incorporated Filter device and method of manufacturing a filter device
US9596536B2 (en) * 2015-07-22 2017-03-14 Google Inc. Microphone arranged in cavity for enhanced voice isolation
US10959630B1 (en) 2017-09-27 2021-03-30 Micro Audiometrics Corporation Dual audiometric probe headset
US11272865B1 (en) 2017-09-27 2022-03-15 Micro Audiometrics Corporation Audiometric probe including dual pressure transducer air system control

Family Cites Families (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3105876A (en) 1963-10-01 Output sxlector
US3513269A (en) 1967-01-26 1970-05-19 Pacific Plantronics Inc Earform mold for supporting acoustic apparatus on a wearer's ear and method of making the mold
US3882848A (en) 1974-01-24 1975-05-13 American Electromedics Corp Test probe for an impedance audiometer
US3934100A (en) 1974-04-22 1976-01-20 Seeburg Corporation Acoustic coupler for use with auditory equipment
US4009707A (en) 1975-07-29 1977-03-01 Teledyne Avionics, A Division Of Teledyne Industries Inc. Automatic acoustic impedance meter
US4002161A (en) 1975-12-02 1977-01-11 American Electromedics Corporation Automatic means for tympanometric testing
US4057051A (en) 1975-12-29 1977-11-08 American Electromedics Corporation Hand held ear test probe
US4122841A (en) 1976-01-09 1978-10-31 American Electromedics Corporation Probe tip
US4237905A (en) 1979-07-31 1980-12-09 Electro Audio Dynamics, Inc. Automatic tympanometric testing means
US4441576A (en) 1982-04-19 1984-04-10 Allen Clayton H Nonlinear passive acoustic filtering
US4548082A (en) 1984-08-28 1985-10-22 Central Institute For The Deaf Hearing aids, signal supplying apparatus, systems for compensating hearing deficiencies, and methods
GB8622671D0 (en) 1986-09-19 1986-10-22 Marchbanks R J Intracranial fluid pressure monitoring
DE19781937B3 (de) 1996-08-12 2016-03-31 Mimosa Acoustics Verfahren und Vorrichtung zum Messen des akustischen Energieflusses in einem Ohrkanal
US5833367A (en) 1996-11-12 1998-11-10 Trutek, Inc. Tympanic thermometer probe cover
CA2272580A1 (fr) 1996-11-25 1998-06-04 Mdi Instruments, Inc. Appareil et procede de diagnostic de l'oreille interne
US6299584B1 (en) 1997-04-03 2001-10-09 Etymotic Research, Inc. Hand-held hearing screener apparatus and removable probe tip therefore
AU2316099A (en) 1998-01-12 1999-07-26 Mdi Instruments, Inc. Ear examining device with temperature sensor
DE19827343A1 (de) * 1998-06-19 1999-12-23 Braun Gmbh Gerät zur Durchführung von Messungen im Ohr
US6152596A (en) 1998-07-02 2000-11-28 Advanced Monitors Corporation Protective cover for infrared thermometer
USD419675S (en) 1998-11-09 2000-01-25 Grason-Stadler, Inc. Ear tip for use in hearing testing
US6129174A (en) 1998-12-30 2000-10-10 Decibel Instruments, Inc. Minimal contact replaceable acoustic coupler
US6258043B1 (en) * 1999-01-05 2001-07-10 Gabriel Raviv Ear probe tip
KR100439648B1 (ko) 2001-08-29 2004-07-12 엘지.필립스 엘시디 주식회사 유기전계발광소자
JP3742330B2 (ja) 2001-10-31 2006-02-01 スター精密株式会社 挿入型イヤホン
US7695441B2 (en) 2002-05-23 2010-04-13 Tympany, Llc Automated diagnostic hearing test
FR2841429B1 (fr) 2002-06-21 2005-11-11 Mxm Dispositif d'aide auditive pour la rehabilitation de patients ateints de surdites neurosensorielles partielles
US6837857B2 (en) * 2002-07-29 2005-01-04 Phonak Ag Method for the recording of acoustic parameters for the customization of hearing aids
JP3835403B2 (ja) 2002-11-26 2006-10-18 セイコーエプソン株式会社 電気光学装置及び電子機器
US20050015018A1 (en) * 2003-05-23 2005-01-20 Dolphin William F. Ear probe and disposable ear tip system
US7354399B2 (en) * 2003-07-28 2008-04-08 Welch Allyn, Inc. Otoscopic tip element and related method of use
US20050226307A1 (en) * 2004-04-07 2005-10-13 Sherin Lussier Infrared thermometer
CN101138273B (zh) 2005-03-10 2013-03-06 唯听助听器公司 一种用于助听器的耳塞
US7771356B2 (en) 2005-11-14 2010-08-10 Spentech, Inc. Ultrasound tympanoscope
US10085677B2 (en) 2005-11-16 2018-10-02 Etymotic Research, Inc. System and method for performing a hearing screening

Also Published As

Publication number Publication date
US20090321177A1 (en) 2009-12-31
US7882928B2 (en) 2011-02-08
WO2009158557A3 (fr) 2010-04-01

Similar Documents

Publication Publication Date Title
US7882928B2 (en) Acoustic measurement tip
US6048320A (en) Inner ear diagnostic apparatus
US10624562B2 (en) Hearing testing probe apparatus with digital interface
AU728030B2 (en) Method and apparatus for measuring acoustic power flow within an ear canal
AU2007201356B2 (en) Surgical system having a non-invasive flow sensor
US20040019294A1 (en) Method for the recording of acoustic parameters for the customization of hearing aids
JPH11514898A (ja) 血圧パラメータの連続的非侵襲性監視の方法および装置
RU2435523C2 (ru) Бесконтактное измерение параметров потока
CN1926921A (zh) 用于真耳测试的方法和设备
US12150782B2 (en) Ear probe for hearing testing
DK2842346T3 (en) HUMAN-like Hearing Simulator
US4930507A (en) Double chamber acoustical tonometer
CN1250157C (zh) 测量眼压的方法和装置
JPH07502670A (ja) トノメータ
US20230233107A1 (en) High-frequency ear probe with a hollow tip
JPS59500455A (ja) 耳の病気を診断するための装置
Siegel Cross-talk in otoacoustic emission probes
JPH1062328A (ja) 触覚センサ
JPS6232002Y2 (fr)
RU68881U1 (ru) Стетоскоп
EP4018935A1 (fr) Procédé de détermination d'une géométrie d'un canal auriculaire ou d'une partie de l'oreille d'une personne
CN114699069A (zh) 一种咽鼓管开放性测试系统
CN118258691A (zh) 用于离体肝脏弹性检测的装置、标定方法及检测方法

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 09771088

Country of ref document: EP

Kind code of ref document: A2

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 09771088

Country of ref document: EP

Kind code of ref document: A2